ISO INTERNATIONAL STANDARD 19903 Second edition 2019-08 Petroleum and natural gas industries Concrete offshore structures Industries du pétrole et du gaz naturel - Structures en mer en béton Reference number IS0 19903:2019(E) Tso @IS02019 IS0 19903:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 19903:2019(E) Contents Page Foreword .vili Introduction. ..ix 1 Scope. 2 Normative references .... 3 Terms and definitions 4 Symbols and abbreviated terms 4.1 Symbols ..8 4.2 Abbreviated terms .10 5 General requirements. .10 5.1 General .10 5.2 Overall planning requirements ..11 5.2.1 General ..11 5.2.2 Quality system 11 5.2.3 Qualifications of personnel! .11 5.2.4 Documentation. .11 5.3 Functional requirements. .12 5.3.1 General ..12 5.3.2 ..12 Position on site 5.3.3 Environmental considerations .12 5.3.4 Platform operational requirements ..13 5.4 Structural requirements .13 5.4.1 General ..13 5.4.2 Structural concept requirements .13 5.4.3 Materials requirements ..14 5.4.4 Execution requirements. ..14 5.4.5 Temporary phases requirements ..14 5.5 Design requirements ..14 5.5.1 General. .14 5.5.2 Design actions ..14 5.5.3 Design resistance .14 5.5.4 Characteristic values for material strength ..15 5.5.5 Partial factors for structural materials .15 5.5.6 Design by testing .15 Action and action effects. .16 6 6.1 General .16 6.1.1 Classification of actions ..16 6.1.2 Determination of action effects .16 6.2 Environmental actions. ..17 6.2.1 General ..17 6.2.2 Wave actions. .17 6.2.3 Current actions. 20 6.2.4 Seismic actions 21 6.2.5 Iceactions 21 6.3 Otheractions. 22 6.3.1 Permanent actions. 22 6.3.2 Variable actions. 22 6.3.3 Actionsfromimposeddeformations 22 6.3.4 Accidentalactions. .23 6.4 Partial factors for actions. 26 6.5 Combinations of actions 27 6.6 Exposure levels. .28 7 Structural analyses .29 @ IS0 2019 - All rights reserved iii IS0 19903:2019(E) 7.1 General. 29 7.2 General principles 29 7.2.1 Planning 29 7.2.2 Extent of analyses 30 7.2.3 Analysis requirements 30 7.2.4 Calculation methods. 31 7.2.5 Verification of analysis results 31 7.2.6 Documentation. 32 7.3 Physical representation. 32 7.3.1 Geometrical definition 32 7.3.2 Material properties 33 7.3.3 Soil-structure interaction 34 7.3.4 Other support conditions 34 7.3.5 Actions 35 7.3.6 Mass simulation 36 7.3.7 Damping 37 7.4 Types of analysis. 37 7.4.1 Static linear elastic analysis. 37 7.4.2 Dynamic analysis 37 7.4.3 Non-linear analysis. .39 7.4.4 Probabilistic analysis 40 7.4.5 Reliability analysis. 40 7.4.6 Discontinuity region analysis. 40 7.5 Analysis requirements. 40 7.5.1 General 40 7.5.2 Analysis of construction stages 40 7.5.3 Transportationanalysis 41 7.5.4 Installation and deck mating analysis 41 7.5.5 In-service strength and serviceability analysis 41 7.5.6 Fatigue analysis. 42 7.5.7 Seismic analysis 42 7.5.8 Analysis of accidental or abnormal design situations. 44 8 Concrete works. 45 8.1 Design 45 8.1.1 Reference standard for design. 45 8.1.2 Design principles for shell members 45 8.1.3 Design principles for transverse shear 45 8.1.4 Design principles for fatigue. 45 8.1.5 Design principles for durability. 46 8.1.6 Design principles for liquid tightness 46 8.1.7 Design principles for prestressed concrete 46 8.1.8 Design principles for second order effects 47 8.1.9 Principles for handling water pressu